Data transmission device



FIG. 1 is a top plan view of a data transmission device;

FIG. 2 is a perspective view of a data transmission device;

FIG. 3 is a second perspective view of a data transmission device;

FIG. 4 is a right side elevation view of a data transmission device;

FIG. 5 is a left side elevation view of a data transmission device;

FIG. 6 is a front elevation view of a data transmission device; and,

FIG. 7 is a rear elevation view of a data transmission device.

The bottom of a data transmission device, not shown, forms no part of the claimed design.

Broken line areas show environmental subject matter and form no part of the claimed design. 

CLAIM I claim the ornamental design for a data transmission device, as shown and described. 